gpiolib: add drivers/gpio directory
David Brownell [Tue, 5 Feb 2008 06:28:17 +0000 (22:28 -0800)]
Add an empty drivers/gpio directory for gpiolib infrastructure and GPIO
expanders.  It will be populated by later patches.

This won't be the only place to hold such gpio_chip code.  Many external chips
add a few GPIOs as secondary functionality (such as MFD drivers) and platform
code frequently needs to closely integrate GPIO and IRQ support.

This is placed *early* in the build/link sequence since it's common for other
drivers to depend on GPIOs to do their work, so they must be initialized early
in the device_initcall() sequence.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
Cc: Eric Miao <eric.miao@marvell.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Philipp Zabel <philipp.zabel@gmail.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ben Gardner <bgardner@wabtec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/arm/Kconfig
drivers/Kconfig
drivers/Makefile
drivers/gpio/Kconfig [new file with mode: 0644]
drivers/gpio/Makefile [new file with mode: 0644]

index 64d19ef..a322f58 100644 (file)
@@ -1122,6 +1122,8 @@ source "drivers/i2c/Kconfig"
 
 source "drivers/spi/Kconfig"
 
+source "drivers/gpio/Kconfig"
+
 source "drivers/w1/Kconfig"
 
 source "drivers/power/Kconfig"
index 3f8a231..d74d9fb 100644 (file)
@@ -52,6 +52,8 @@ source "drivers/i2c/Kconfig"
 
 source "drivers/spi/Kconfig"
 
+source "drivers/gpio/Kconfig"
+
 source "drivers/w1/Kconfig"
 
 source "drivers/power/Kconfig"
index 0ee9a8a..f1c11db 100644 (file)
@@ -5,6 +5,7 @@
 # Rewritten to use lists instead of if-statements.
 #
 
+obj-$(CONFIG_HAVE_GPIO_LIB)    += gpio/
 obj-$(CONFIG_PCI)              += pci/
 obj-$(CONFIG_PARISC)           += parisc/
 obj-$(CONFIG_RAPIDIO)          += rapidio/
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
new file mode 100644 (file)
index 0000000..560687c
--- /dev/null
@@ -0,0 +1,32 @@
+#
+# GPIO infrastructure and expanders
+#
+
+config HAVE_GPIO_LIB
+       bool
+       help
+         Platforms select gpiolib if they use this infrastructure
+         for all their GPIOs, usually starting with ones integrated
+         into SOC processors.
+
+menu "GPIO Support"
+       depends on HAVE_GPIO_LIB
+
+config DEBUG_GPIO
+       bool "Debug GPIO calls"
+       depends on DEBUG_KERNEL
+       help
+         Say Y here to add some extra checks and diagnostics to GPIO calls.
+         The checks help ensure that GPIOs have been properly initialized
+         before they are used and that sleeping calls aren not made from
+         nonsleeping contexts.  They can make bitbanged serial protocols
+         slower.  The diagnostics help catch the type of setup errors
+         that are most common when setting up new platforms or boards.
+
+# put expanders in the right section, in alphabetical order
+
+comment "I2C GPIO expanders:"
+
+comment "SPI GPIO expanders:"
+
+endmenu
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
new file mode 100644 (file)
index 0000000..369e4fc
--- /dev/null
@@ -0,0 +1,4 @@
+# gpio support: dedicated expander chips, etc
+
+ccflags-$(CONFIG_DEBUG_GPIO)   += -DDEBUG
+